SU1726251A1 - Multicomponent building mortar forming plant - Google Patents

Abstract

The invention relates to the building materials industry, in particular to technological equipment for compacting building mixtures in the mold. The purpose of the invention is to improve the quality of products by means of double-sided amplitude-controlled shock pulses with compensation for rebound upon impact with holding pulses of electromagnetic forces and subsequent frequency-controlled vibroforming. The multi-component arbolite molding unit contains an anvil 4, a frame with guides 3 in which a vertically movable frame 2 with a form 1 is in shock contact with a stantikum by connecting to the frame hinges 12, the other ends of which are connected to the cores 11 of the upper and lower electromagnets 10, rigidly fixed on opposite vertically parallel sides of the bed. The power windings of the upper and lower electromagnets 10 are switched by the respective magnetic starters 9, the control windings of the magnetic starters are included in the collector circuits of each of the stages of the multivibrator 7 with an 8-step device over the ranges and a smooth control of the frequency of the generated pulses. When the frequency of the multivibrator is 1 ... 2 Hz, the electromagnets are alternately powered and the unit operates in a double-sided vertical impact molding mode, when the frame strikes the anvil or the upper surface of the mixture in the form with a punch-prune 5. The amplitude of the shock pulses is adjusted by height securing the loading punch 5 with the rod 6. When the frequency is on the order of 30 Hz, due to the inertia of the movable frame with the shape, the installation is switched to the vibration compaction mode. 3 il. SO S vi yo go

Description

The invention relates to the building materials industry, in particular to technological equipment for compacting building mixtures in the mold.

The purpose of the invention is to improve the quality of products by means of double-sided amplitude-controlled shock impulses with compensation of rebound upon impact by holding impulses electromagnetic

forces and subsequent frequency controlled vibration molding.

Figure 1 presents the installation, General view; 2 is an electrical installation diagram; FIG. 3 is a graph characterizing the dependence of the bulk density (p) and strength (R) of the samples on the duration (g) of the impulses of the force that holds the frame from rebound after impact.

The multi-component forming of arbolita contains form 1, rigidly connected with a vertically movable frame 2 installed in the bed guides.

3 and shock contact with the anvil

4 when moving the frame down. When the frame is moved upwards, the mixture in the form 1 is in shock contact with the punch-load 5, the height of which is adjusted by the rod 6. The vertical movement of the frame 2 is carried out through the central axes of the hinges 12, the free ends of which are connected to the cores 11 of the upper and lower electromagnets 10 rigidly fixed on opposite, vertically parallel sides of the bed. The power of the power windings of the upper and lower electromagnets 10 is switched by the respective magnetic starters 9. The control windings of the magnetic starters 9 are included in the collector circuits of each of the stages of the multivibrator 7

with the device 8 stepwise in range and smooth control of the frequency of the generated pulses.

The installation works as follows.

After loading the mold 1 with the mixture, the punch-prigruzh 5 is rigidly fixed in the bed 3 with the rod b at a height of 6-8 cm above the upper surface of the mixture. The frequency regulator 8 sets the frequency of the 7 pulses generated by the multivibrator in the order of 1 ... 2 Hz. The magnetic starters 9, in accordance with the frequency and duration of the generated pulses, alternately connect the power to the corresponding windings of the power electromagnets 10. When the magnetic starter is connected to the upper electromagnet, the lifting force from the core 11 is transmitted through the hinges 12 to the moving frame 2, which accelerates up to the impact a mixture of punch-prigruzh 5. When the duration of the generated pulse is longer than the time of raising the frame and impact, the current in the windings of the upper electromagnet will flow even after impact due to which additional compression of the frame with the mold and the mixture to the punch, i.e. the necessary impulse of the holding electromagnetic force. The end of the pulse duration in the first magnetic starter coincides with the beginning of the pulse in the second magnetic starter. Triggers the lower electromagnet. The frame with the form and the mixture drops down with acceleration and hits the anvil. Until the pulse in the magnetic starter ends, the electromagnet will keep the frame from rebounding in this position. Then, the process is repeated many times automatically with the frequency of the pulses generated by the multivibrator repeating. After preliminary two-sided vertical impact molding, a more fine adjustment of the product to the condition by vibration molding is carried out, for which the frequency of the generated pulses is shifted in steps of 20 ... 30 Hz. In this case, the punch-proruzh 5 freely lowers onto the upper surface of the mixture, does not fix the rod 6. Due to the inertia of the mass of the moving frame with the form and mixture at a switching frequency of electromagnets of 20 Hz, the frame will rise by a few mm, t. e. the setting by step frequency switching is switched to the vibroforming mode with the attachment. By smoothly varying the frequency with the help of the chain (R, C), the parameters of vibroforming are changed: amplitude and frequency, which ensures the optimality of the mode for the parameters of a moldable mixture.

The positive effect of the invention is based on the two-sided impact, compensation of the rebound upon impact by holding impulses of electromagnetic forces, regulation of both the amplitude of the shock impulses and the frequency of vibroforming. The compaction quality of arbolit type mortars is characterized by bulk density (/ o) and strength (R). From FIG. 3 it follows that the effective duration of the impulse of the holding forces from rebound upon impact is 0.4 ... 0.6 s. The optimal height of the discharge when using electromagnets is h 5 cm. Taking into account transients, the duration of a single pulse generated by the multivibrator

T t +

0.7 s;

R 3i R & 1 MΩ; C (52 1 microfarads. The percentage of yield of products with double-sided shock compaction with compensation of rebound and subsequent fine-tuning by vibroforming increases compared with unilateral impact molding from 88 to 99.9%.

Claims (1)

The invention of the multicomponent molding of arbolit, containing a frame with an anvil and rails, in which a vertically movable frame with a form is installed, impact-contacting with a frame with the help of hinges, in order to improve the quality products by two-sided, amplitude-adjustable shock pulses with rebound compensation when struck by holding impulses of electromagnetic forces and subsequent frequency-controlled vibroforming, the installation contains a punch-load placed over the form with the possibility of impact contact with the mixture when the frame moves upwards, the upper and lower electromagnets, rigidly fixed on opposite vertically parallel sides of the body of the box through the hinges are connected with a movable frame, and a multivibrator with a stepwise range and a smooth frequency control of the generated pulses, the collector circuit of each stage of which in each range includes the control winding of the corresponding magnetic starter, made with the possibility of alternating the duration of the generated pulses, connecting power to the power winding sections of the upper or lower electromagnets. ten, eleven. 12fig. 55 kg / c 8QOJ 700600 500 5.7 a2 0.3 OL 0.5 0.6 0.7 Fi. H .-g